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基于严格耦合波理论,数值计算了一种在闪耀斜面镀膜的亚波长光栅结构,并首次提出将该光栅应用于光导板的设计中,使光导板衍射的RGB光束无需经过滤色片,直接透射相应的像素点。在数值计算中,设定入射光为TE偏振态、入射角为60°、波长为RGB三基色。光栅以有机玻璃为基底,二氧化钛为膜层,并随波长改变周期、闪耀角等参数。计算结果表明,该光栅的一级衍射光可垂直于表面出射,一级衍射效率随膜厚渐变,最高达37%,其余非零级次的衍射效率低于2%。将该特性的光栅应用于新型光导板的数值建模中,并对光栅的制作进行了工艺容差分析,计算得归一化能量的标准差小于1%,总衍射效率接近80%。
Based on the strictly coupled wave theory, a subwavelength grating structure is numerically calculated, and the grating is applied to the design of the light guide plate for the first time so that the RGB light beam diffracted by the light guide plate does not need to pass through the color filter and is directly transmitted The corresponding pixel. In numerical calculation, the incident light is set to TE polarization state, the incident angle is 60 °, and the wavelength is RGB three primary colors. Grating based on plexiglass, titanium dioxide film, and with the wavelength change cycle, shine angle and other parameters. The calculated results show that the first-order diffracted light of the grating can emerge perpendicular to the surface, the first-order diffraction efficiency changes with the film thickness up to 37%, and the diffraction efficiency of the remaining non-zero order is less than 2%. The grating with this characteristic was applied to the numerical modeling of a new type of light guide plate. The tolerance analysis of the grating was carried out. The standard deviation of the normalized energy was less than 1% and the total diffraction efficiency was close to 80%.